tag:blogger.com,1999:blog-5376628436133716219.post8030058514983472604..comments2024-03-29T02:14:39.189-07:00Comments on Why I hate physics: The moon was a ghostly galleonMarty Greenhttp://www.blogger.com/profile/17624084719249673373noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5376628436133716219.post-22967771442667962632013-08-16T04:12:16.565-07:002013-08-16T04:12:16.565-07:00
You might find the Oren-Nayar reflectance model i...<br />You might find the Oren-Nayar reflectance model interesting. <br /><br />http://en.wikipedia.org/wiki/Oren–Nayar_reflectance_modelAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-39135748734551337492013-05-24T17:48:34.616-07:002013-05-24T17:48:34.616-07:00Sorry I meant to put the comment to your other pos...Sorry I meant to put the comment to your other post here:<br />http://marty-green.blogspot.cz/2012/01/what-if-moon-were-made-of-golfballs.html<br /><br />PeterAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-52569692122384446512013-05-24T17:45:28.571-07:002013-05-24T17:45:28.571-07:00Hi Marty,
Sorry for this late comment (over a yea...Hi Marty,<br /><br />Sorry for this late comment (over a year now from your post), but I could not resist. Nice post, BTW.<br /><br />Recently I was thinking about a similar problem - visual magnitude of the ideal/Lambertian moon/planet depending on its phase. After I did some calculations, I was trying to verify their correctness on internet. To my surprise it was really hard to find anything relevant, but after googling for couple of hours I found your post.<br /><br />My result was that the spherical Lambertian full moon would provide 1/3 less reflected light than the flat drywall moon. So first I thought... 33% is different from your 50%, but after reading your post again I realized it's the same thing (I bet you know what I mean). You know, it's 2am now and it's hard to focus :). So good news for both of us - we got the same result.<br /><br />Anyway, I went further with my calculations as I was interested in the amount of reflected light from the moon in certain phase relative to the full moon. Still talking about ideal Lambertian moon. Really interesting integrals, man ;) For example, the first/third quarter moon (half-circle) gives exactly 1/pi (approx. 32%) of light compared to the full moon. As I said, I could not verify the result and I was wondering if it's correct. If you are interested and find some time to do the calculations, would you mind to confirm you get the same result? Thanks.<br /><br />PeterAnonymousnoreply@blogger.com